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Reference.org
Superdense carbon allotropes
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<p>Superdense carbon allotropes are proposed configurations of <a href="/facts/Carbon_atoms/ukrgQexo">carbon atoms</a> that result in a stable material with a higher density than <a href="/facts/Diamond/IBUdnd1y">diamond</a>. Few hypothetical carbon allotropes denser than diamond are known. All these allotropes can be divided at two groups: the first are hypothetically stable at ambient conditions; the second are high-pressure carbon allotropes which become quasi-stable only at high pressure. </p>